1291131097 has 2 divisors, whose sum is σ = 1291131098. Its totient is φ = 1291131096.

The previous prime is 1291131019. The next prime is 1291131103. The reversal of 1291131097 is 7901311921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 653518096 + 637613001 = 25564^2 + 25251^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291131097 - 2⁷ = 1291130969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291831097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645565548 + 645565549.

It is an arithmetic number, because the mean of its divisors is an integer number (645565549).

Almost surely, 2^1291131097 is an apocalyptic number.

It is an amenable number.

1291131097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291131097 is an equidigital number, since it uses as much as digits as its factorization.

1291131097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 34.

The square root of 1291131097 is about 35932.3127143244. The cubic root of 1291131097 is about 1088.9053053015.

The spelling of 1291131097 in words is "one billion, two hundred ninety-one million, one hundred thirty-one thousand, ninety-seven".